Electric-lamp globe



(No Model.)

G. J. MURDOCK.

ELECTRIC LAMP GLOBE.

N. PETKRS. Pbotvunwgnpher. wnshinginn. D. c,

UNITED STATES PATENT QEFICE.

GEORGE J. MURDOUK, OF BIGHAMTON, NEN YORK.

ELECTRIC-LAMP G-LOBE.

SPECIFICATION formingpart of' Letters Patent No. 274,959, dated April 3, 18283.

Application filed August 29, 1882.

To all tr/Lom tt may concern:

Be it known that I, GEORGE J. MURDocK, ot' Binghamton, in the count)r ot' Broome, in the State ofNew York, have invented new and useful Improvements in GarbouSaving Globes for ElectricLamps, ot` which the following', taken -in connection with the accompanying drawings, is a full, clear, and exact description.

This invention consists in a novel construction and combination of a transparent or opalescent globe and its attachments to an electric lamp, whereby the latter is eii'ectually isolated from the atmospheric air, and thus the carhons oi' the said lamp are protected irom the destructive influence ot oxygen, said invention being more particularly designed for use iu connection with the electric lamp for which I have now pending Letters lntent ot' the United States. t

t In the accompan) ing drawings, Figure l is an exterior side view ot my invention. Fig. 2 is a vertical transverse section ot' the same, and Fig. 3 is a detached top view of the base which supports the lamp.

Similar letters of reference indicate correspouding parts.

A represents the electric lanp in the form of a rigid vertical skeleton frame, carrying the carbons at opposite ends and serving as electrical conductors to said carbons.

B denotes the basewhich supports the at'oresaid lamp, a circular vnlcanite plate or block, D, being interposed and secured to the base to isolate the lamp from the base. Concentricallyaround the insulatingblock D is a. rigid flange,` b, projecting from the top ot' the base B, andformin gan annular grooveor depression, a, between said ^flange and insulating-block.

G represents a glass or other transparent or opalescent bottomless globe, having a circumferentially-red-uced closed top portion or dome, G', specially fitted for the top of the lamp, for which I have now pending United States Letters Patent. lhe bottom portion ofthe globe has an inward circumferential shoulder or oft- `set, n, by which it rests on top ot' the flange b (No model.)

sooient quantity of water, oil, or other snitable liquid to immerse the foot ofthe globe, the same becomes hermetically sealed in its seat on the base B, and thereby eft'ectually excludes the air from thel interior ofthe globe.

(l is a collaror circular band, tirmly secured to the exterior of the globe immediately above the offset u thereof, and projecting downward therefrom, thus inclosing between the collar C and foot ot' the globe the flange b on the base B. The offset n, while forming the support for the globe, serves at the same time to brace the same to resist the inward pressure ot' the collar (l, which is litted closely thereto. The collar U is provided at two diametricallyopposite points with two lateral extensions or lugs, r r, to the outer end of each ot which is hinged a clasp, g, having on its free end a hook or shoulder, o, b v which said clasp engages the under side ot" a lateral projecting lug, h, on the side of the base B, and thus retains the said base tightly against the foot ofthe globe G.

On the lug lt of the base isa dat-headed key oriturn-button, 7c, `which protrudes through a ,vertical slot, ti, in the clasp, and when turned as'tride the clasp locks the latter in its beforedescribed engagement with the lug h. Vertically through thelugstr ofthe collar() passtwo tubes, d d, which are iirmly secured thereto, and terminate with theirlowerendin proximity to the top of the lug h ofthe baseB. Theopposite ends of said tubes extend upward along the outside ot' the globe and are rigidly connected to the yoke El, which encompasses the dome G at its junction with the main portion orbodyr ot' the globe G. In the tubes d slide rodsf, secured to the lugs h'of the base. To

theside ot the upper endot1 the rods is attached a guard or stop, s, in the form of a. lug, which protrudes through a vertical slot, e, in the side of the tube, said slot being closed at its lower end at such a point as to arrest the descent of the lamp when removed from the globe, as hereinafter more fully explained. I

designates a bail or fork connected to the yoke '9 H, and extended over the dome G', and pro-` vided in the center of the top with a ring, L, or other suitable device for suspending the apparatus from the ceiling or other desired point.

E E and F F are .binding-posts attached,

IOO

respectively, to the Abase B and yoke H, but I insulated therefrom by guttaepercha collars,

the upper posts being connected with the lower posts by insulated wires ll, which communicate with the lamp A by insulated wires m m, extended from the lower binding-posts through suitable channels, c, in the base B and block D, and connected with the base of the lampframe, which latter serves to conduct the electric currents to the carbons, as hereinbefore set forth. Thepositivc current passes down the wire l on one side of the globe, thence through the binding-postEandthewirem tothe lamp-frame, the negative current passing out through the other wire m, and thence through the binding-post E' and up the wire Z, which connects the post E with the binding'post F.

The operation ot' my invention is as follows:

VWhen the lamp A is to be supplied with new carbons, the operator grasps with one hand the base B, which for that purpose is provided with asuitable handle, N. With the other hand he turns the key K, so as to bring the flattened head thereof in line with the slott ot' the clasps g, and throws the said clasps off from thelugs It ofthe base B. This releases the said base and allows the operator to lower it, together with the lamp lseated thereon, until the guard or stop s on the rods f encounters the lower end ofthe slot e ofthe tubes d, which encounter arrests the descent ot' the base at a point snuicently distant from the foot of the globe to afford convenient access for mauil'iulating the .carbons of the lamp.

[twill be observed that by closing the lower end of the slot e, as described, the danger of accidentally letting the lamp drop completely away from the globe is obviated.

The introduction of the lamp into the globe is as readily effected as its before-described removal therefrom.

Having described my in vention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. 1n combination with the electric lamp A, the4 globe G, collar C, secured to the globe, the base B, detachably connected with the collar and provided with the annular groove or f depression @,aud the insulating-block D,inter 2. In combination with the electric lamp A, the globe G, collar C, xed to said globe, the base B, detachably connected with the collar and provided with the annular flange b, the insulating-block D, arranged inside ofthe flange with the space a between them, the binding-posts E E', connected to the base, and the wires m m, passing from said posts through the base and block D, and to the electric conductors of the inclosed lamp, substantially as specified and sho-wn.

3. The combination, with the electric lamps A and globe G, of the -voke H, pendent tubes d, provided with the slot e, rods f, provided with the stop s, the collar C, secured to the globe and to the tubes d, the base B, connected to the rodsf, the clasp g, the key K, and insulatingblock D, all as shown and described.

4. In combination with the lamp A and globe G, the yoke H, sliding hangers df, base B, insulating-block D, clasp g, binding-posts E E and F F', connected, respectively, to the base and yoke, and the external conductingwires, Z l, and internal conductingwires, m m, substantially as described and shown.

5. In combination with the lamp A, the globe G, formed with the circumferentially-contract! ed top portion, T, the yoke H, encompassing said top portion, the hangers df, collar O, base B, and clasp g, substantiallyin the manner shown and described. l

6. The combination ofthe base B, provided with the insulating-block D, annular flange b, and groove a, the globe G, having the olfset n, the collar G, secured to the globe and projecting below the offset thereof and provided with thelateral extensions r r, andthe clasp g, connected to said extensions, substantially as described and shown.

c In testimony whereofI have hereunto signed my name and affixed my seal, in the presence of two attesting witnesses, at Binghamton, in the county of Broome, in the State of New York, this 22d day ot' August, 1882.

GEORGE J. MURDOCK. lL. s]

Witnesses:

F. W. Downs, ARTHUR GRIFFIN. 

